Overload issue on M1 Pro

[ralphk1]

I have a Motocaddy M1 Pro of 2014 vintage which has given me excellent service. In the last couple of years I have had to replace the motor, control boards etc. I have now a situation whereby the trolley runs for 50 yards or so and stops with " L" showing on the screen which i assume is overload. I disconnect the battery. Immediately reconnect and the trolley runs perfect for next 50 yards or so. Problem then repeats itself. Other than a new motor which I replaced a year ago. Does anyone have any ideas?
Many thanks

 

[Red scorpion]

Check wheels are on proper sides, they should be marked L and R